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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Income Tax Disclosure [Abstract]          
Income tax (benefit) provision $ (0.3) $ 2.1 $ 0.6 $ 4.5  
Effective income tax rate 4.50% (17.50%) (2.00%) (15.40%)  
Federal statutory income tax rate 35.00%   35.00%    
Settlement of previously unrecognized Tax Benefits     0.7    
Unrecognized Tax Benefits $ 16.9   $ 16.9   $ 17.6